BLUE PRINT SPECIFICATIONS: Part 1

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MAIN BEARING BORE:

SMALL JOURNAL:

MEDIUM JOURNAL:

(400) LARGE JOURNAL:

 2.4906 - 2.4915

 2.6406 - 2.6415

 2.8406 - 2.8415

MAIN BEARING CLEARANCE:

SMALL JOURNAL:

 No. 1 0.0008 - 0.0080

 No. 2-4 0.0018 - 0.0020

 No. 5 0.0010 - 0.0036

LARGE JOURNAL:

 No. 1-4 0.0013 - 0.0025

 No. 5 0.0023 - 0.0033

MAIN BEARING SIDE CLEARANCE:

MINIMUM:

PREFERRED:

 0.0020 - 0.0030

 0.0050 - 0.0070

 

 

ROD BEARING CLEARANCE:

SMALL JOURNAL:

LARGE JOURNAL:

 0.0007 - 0.0028

 0.0013 - 0.0035

ROD BEARING SIDE CLEARANCE:

SIDE CLEARANCE:

MIN. PER PAIR RODS:

 0.0020 - 0.0250

 0.0100 - 0.0200

CRANKSHAFT END CLEARANCE:

THRUST CLEARANCE:

 

 0.003 - 0.007

 

 

PISTON CLEARANCE:

CHEVY CAST:

ROAD USE:

STREET / STRIP:

RACING:

 0.0015 - 0.0025

 0.0025 - 0.0030

 0.0030 - 0.0040

CHEVY FORGED:

 

 

ROAD USE:

STREET / STRIP:

RACING:

0.0040 - 0.0050

0.0050 - 0.0060

0.0055 - 0.0065

AFTERMARKET:

Follow manufactures recommendations.

NOTE: Measured at centerline of wristpin hole, perpendicular to pin. Finish bores with No. 500 grit stone.

PISTON GAS PORT:

 

0.045 - 0.056 Dia.. (Hot Rod)

0.025 - 0.030 Dia.. (Car Craft)

WRIST-PIN CLEARANCE:

PISTON:

ROD:

END PLAY:

 0.0006 - 0.0008

 0.0008 - 0.0010 (Floating pin)

 0 - 0.0050

 

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